<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script>
    for(var i=1;i<=5;i++){
            console.log('i='+i);
            if(i==3){
                break;
            }
            console.log('ending')
        }
    </script>
</head>
<body>
    
</body>
</html>